I am not bullish on Trump long term, but not because some extremists also support him, but because of his own randomness and inability to get things done in Washington.
The traditional conservative movement is dying out. Quite literally, it has a demographic problem that it is not sure how to resolve. In it's place, you have the alt-right, which does tend to be more youthful, but which acts as an umbrella for a wide variety of extremist viewpoints, everything from extreme libertarianism to conspiracy theorists to white nationalism to single-issue anti-islamic advocates and a whole host of others. And within that milieu, a large proportion of people are not singularly committed to those hard-right ideologies as much as they define themselves solely in their rejection of liberalism, the left, or social justice. The result is a whole host of confusion. The alt-right is constantly infighting about cultural issues such as traditional masculinity or gay rights, to the difference between opposition to illegal immigration (a viewpoint which can claim to be more centrist) or opposing immigration altogether, including legal (which is held by the nationalist wing of the movement).
As the voting base disappears, these groups will have to figure out how to grow their movement, make political demands, maintain a presence without burning out, etc. Just like all movements do. But that's exactly where those intense internal divisions come in and wreak havoc.
they won't change their position. If anything, their position will be radicalized. For example, from classical liberal to alt-right.
This is been a common sort of mantra since Trump won the presidency. Whenever we have a controversial event like this, people make a statement that any actions by those on the left will only further radicalize people in the other direction. I don't think it's true, but most of all, I don't think that other direction really leads anywhere useful. For the reasons I outlined previously.
Superficially at most. When you go to some of the most popular alt-right facebook pages, and you see caricatures of Jews and whole racial groups consistently disparaged and stereotyped, and when you see just how many people posting in them have cross-interests with white supremacist and misogynist movements, you realize that "welcoming" is a very, very narrow term.
The alt-right is not constantly infighting.
The left are more likely to devolve into infighting.
This google guy was moderate left wing and the hard line social justice response from Google and the media will alienate a lot more of the intellectual left.
Hispanics and African Americans often lean socially conservative.
Gay men are a lot more fiscally conservative than you might think.
None of those groups identify with single white woman.
Etc etc.
His first interviews were with alt-right Youtube channels.
I agree with your points about lots of minority groups being socially (and/or fiscally) conservative. It's lucky for the left that the white social conservatives have been driving them away consistently for decades.
I'd argue he is still left of center.
He is just interviewing with the groups who will give him a fair go.
So yeah he's definitely in that general area.